Great product at a great price. With almost twice the capacity of traditional 9V alkaline batteries, it's a great way to power the products that need them. They effectively upgrade any product they are installed in to the newer lithium technology. Each battery has its own built-in charging circuit and charges from any standard USB port. The green LED indicator shows the charging status. I haven't disassembled them to see what they look like on the inside, but they seem very good on the outside. The physical size of the battery and contacts is the same as regular batteries, so they should fit any device designed for them. I definitely recommend them.
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